1620210541257 has 24 divisors (see below), whose sum is σ = 2917781755200. Its totient is φ = 841667813280.

The previous prime is 1620210541249. The next prime is 1620210541283. The reversal of 1620210541257 is 7521450120261.

1620210541257 is a `hidden beast` number, since 1 + 6 + 20 + 210 + 5 + 412 + 5 + 7 = 666.

It is not a de Polignac number, because 1620210541257 - 2³ = 1620210541249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620210541457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1168982382 + ... + 1168983767.

It is an arithmetic number, because the mean of its divisors is an integer number (121574239800).

Almost surely, 2^{1620210541257} is an apocalyptic number.

It is an amenable number.

1620210541257 is a deficient number, since it is larger than the sum of its proper divisors (1297571213943).

1620210541257 is a wasteful number, since it uses less digits than its factorization.

1620210541257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2337966173 (or 2337966170 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The spelling of 1620210541257 in words is "one trillion, six hundred twenty billion, two hundred ten million, five hundred forty-one thousand, two hundred fifty-seven".