57621170721287 has 2 divisors, whose sum is σ = 57621170721288. Its totient is φ = 57621170721286.

The previous prime is 57621170721259. The next prime is 57621170721343. The reversal of 57621170721287 is 78212707112675.

It is an a-pointer prime, because the next prime (57621170721343) can be obtained adding 57621170721287 to its sum of digits (56).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 57621170721287 - 2²² = 57621166526983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57621170321287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28810585360643 + 28810585360644.

It is an arithmetic number, because the mean of its divisors is an integer number (28810585360644).

Almost surely, 2^{57621170721287} is an apocalyptic number.

57621170721287 is a deficient number, since it is larger than the sum of its proper divisors (1).

57621170721287 is an equidigital number, since it uses as much as digits as its factorization.

57621170721287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4609920, while the sum is 56.

The spelling of 57621170721287 in words is "fifty-seven trillion, six hundred twenty-one billion, one hundred seventy million, seven hundred twenty-one thousand, two hundred eighty-seven".