2157195147858 has 24 divisors (see below), whose sum is σ = 4674562755408. Its totient is φ = 718966597752.

The previous prime is 2157195147853. The next prime is 2157195147871. The reversal of 2157195147858 is 8587415917512.

2157195147858 is a `hidden beast` number, since 2 + 1 + 5 + 71 + 95 + 1 + 478 + 5 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 2157195147795 and 2157195147804.

It is not an unprimeable number, because it can be changed into a prime (2157195147853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8069116 + ... + 8332167.

It is an arithmetic number, because the mean of its divisors is an integer number (194773448142).

Almost surely, 2^{2157195147858} is an apocalyptic number.

2157195147858 is an abundant number, since it is smaller than the sum of its proper divisors (2517367607550).

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

2157195147858 is a wasteful number, since it uses less digits than its factorization.

2157195147858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16408598 (or 16408595 counting only the distinct ones).

The product of its digits is 28224000, while the sum is 63.

The spelling of 2157195147858 in words is "two trillion, one hundred fifty-seven billion, one hundred ninety-five million, one hundred forty-seven thousand, eight hundred fifty-eight".