55157082110621 has 2 divisors, whose sum is σ = 55157082110622. Its totient is φ = 55157082110620.

The previous prime is 55157082110573. The next prime is 55157082110633. The reversal of 55157082110621 is 12601128075155.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32237299284100 + 22919782826521 = 5677790^2 + 4787461^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55157082110621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55157082110021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27578541055310 + 27578541055311.

It is an arithmetic number, because the mean of its divisors is an integer number (27578541055311).

Almost surely, 2^{55157082110621} is an apocalyptic number.

It is an amenable number.

55157082110621 is a deficient number, since it is larger than the sum of its proper divisors (1).

55157082110621 is an equidigital number, since it uses as much as digits as its factorization.

55157082110621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 168000, while the sum is 44.

The spelling of 55157082110621 in words is "fifty-five trillion, one hundred fifty-seven billion, eighty-two million, one hundred ten thousand, six hundred twenty-one".