101999792640 has 160 divisors (see below), whose sum is σ = 326403323136. Its totient is φ = 27173027840.

The previous prime is 101999792551. The next prime is 101999792663. The reversal of 101999792640 is 46297999101.

It is a tau number, because it is divible by the number of its divisors (160).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8465020 + ... + 8477060.

Almost surely, 2^101999792640 is an apocalyptic number.

101999792640 is a gapful number since it is divisible by the number (10) 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 101999792640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (163201661568).

101999792640 is an abundant number, since it is smaller than the sum of its proper divisors (224403530496).

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

101999792640 is a wasteful number, since it uses less digits than its factorization.

101999792640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13170 (or 13154 counting only the distinct ones).

The product of its (nonzero) digits is 2204496, while the sum is 57.

The spelling of 101999792640 in words is "one hundred one billion, nine hundred ninety-nine million, seven hundred ninety-two thousand, six hundred forty".