66797639370 has 864 divisors, whose sum is σ = 244290271680. Its totient is φ = 12485975040.

The previous prime is 66797639357. The next prime is 66797639383. The reversal of 66797639370 is 7393679766.

It is an interprime number because it is at equal distance from previous prime (66797639357) and next prime (66797639383).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 66797639298 and 66797639307.

It is an unprimeable number.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 487573942 + ... + 487574078.

It is an arithmetic number, because the mean of its divisors is an integer number (282743370).

Almost surely, 2^66797639370 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66797639370, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122145135840).

66797639370 is an abundant number, since it is smaller than the sum of its proper divisors (177492632310).

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

66797639370 is a wasteful number, since it uses less digits than its factorization.

66797639370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 207 counting only the distinct ones).

The product of its (nonzero) digits is 54010152, while the sum is 63.

The spelling of 66797639370 in words is "sixty-six billion, seven hundred ninety-seven million, six hundred thirty-nine thousand, three hundred seventy".