642370145643256 has 16 divisors (see below), whose sum is σ = 1205453615742000. Its totient is φ = 320915848112064.

The previous prime is 642370145643253. The next prime is 642370145643263. The reversal of 642370145643256 is 652346541073246.

It is a self number, because there is not a number n which added to its sum of digits gives 642370145643256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642370145643253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33653078556 + ... + 33653097643.

It is an arithmetic number, because the mean of its divisors is an integer number (75340850983875).

Almost surely, 2^{642370145643256} is an apocalyptic number.

It is an amenable number.

642370145643256 is a deficient number, since it is larger than the sum of its proper divisors (563083470098744).

642370145643256 is a wasteful number, since it uses less digits than its factorization.

642370145643256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67306177398 (or 67306177394 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 58.

The spelling of 642370145643256 in words is "six hundred forty-two trillion, three hundred seventy billion, one hundred forty-five million, six hundred forty-three thousand, two hundred fifty-six".