16215157840 has 80 divisors (see below), whose sum is σ = 45353704320. Its totient is φ = 5266874880.

The previous prime is 16215157837. The next prime is 16215157841. The reversal of 16215157840 is 4875151261.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×16215157840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 16215157793 and 16215157802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16215157841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 751351 + ... + 772630.

It is an arithmetic number, because the mean of its divisors is an integer number (566921304).

Almost surely, 2^16215157840 is an apocalyptic number.

16215157840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16215157840 is an abundant number, since it is smaller than the sum of its proper divisors (29138546480).

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

16215157840 is a wasteful number, since it uses less digits than its factorization.

16215157840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524020 (or 1524014 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 16215157840 in words is "sixteen billion, two hundred fifteen million, one hundred fifty-seven thousand, eight hundred forty".