2157255044644 has 24 divisors (see below), whose sum is σ = 4402561318400. Its totient is φ = 924537875688.

The previous prime is 2157255044621. The next prime is 2157255044683. The reversal of 2157255044644 is 4464405527512.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786170292 + ... + 786173035.

Almost surely, 2^{2157255044644} is an apocalyptic number.

It is an amenable number.

2157255044644 is an abundant number, since it is smaller than the sum of its proper divisors (2245306273756).

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

2157255044644 is a wasteful number, since it uses less digits than its factorization.

2157255044644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1572343352 (or 1572343336 counting only the distinct ones).

The product of its (nonzero) digits is 5376000, while the sum is 49.

The spelling of 2157255044644 in words is "two trillion, one hundred fifty-seven billion, two hundred fifty-five million, forty-four thousand, six hundred forty-four".