257207615421477 has 32 divisors (see below), whose sum is σ = 394373584146432. Its totient is φ = 146063041496064.

The previous prime is 257207615421469. The next prime is 257207615421583. The reversal of 257207615421477 is 774124516702752.

It is not a de Polignac number, because 257207615421477 - 2³ = 257207615421469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257207615421477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257207615421277) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28894113 + ... + 36732614.

It is an arithmetic number, because the mean of its divisors is an integer number (12324174504576).

Almost surely, 2^{257207615421477} is an apocalyptic number.

It is an amenable number.

257207615421477 is a deficient number, since it is larger than the sum of its proper divisors (137165968724955).

257207615421477 is a wasteful number, since it uses less digits than its factorization.

257207615421477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65627897.

The product of its (nonzero) digits is 46099200, while the sum is 60.

The spelling of 257207615421477 in words is "two hundred fifty-seven trillion, two hundred seven billion, six hundred fifteen million, four hundred twenty-one thousand, four hundred seventy-seven".