220979111640 has 512 divisors, whose sum is σ = 826166476800. Its totient is φ = 46143406080.

The previous prime is 220979111623. The next prime is 220979111657. The reversal of 220979111640 is 46111979022.

It is an interprime number because it is at equal distance from previous prime (220979111623) and next prime (220979111657).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 220979111592 and 220979111601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 181576312 + ... + 181577528.

It is an arithmetic number, because the mean of its divisors is an integer number (1613606400).

Almost surely, 2^220979111640 is an apocalyptic number.

220979111640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 220979111640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (413083238400).

220979111640 is an abundant number, since it is smaller than the sum of its proper divisors (605187365160).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

220979111640 is a wasteful number, since it uses less digits than its factorization.

220979111640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655 (or 1651 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 42.

The spelling of 220979111640 in words is "two hundred twenty billion, nine hundred seventy-nine million, one hundred eleven thousand, six hundred forty".