3420021662557 has 2 divisors, whose sum is σ = 3420021662558. Its totient is φ = 3420021662556.

The previous prime is 3420021662537. The next prime is 3420021662579. The reversal of 3420021662557 is 7552661200243.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3333476259961 + 86545402596 = 1825781^2 + 294186^2 .

It is a cyclic number.

It is not a de Polignac number, because 3420021662557 - 2²⁷ = 3419887444829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3420021662507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1710010831278 + 1710010831279.

It is an arithmetic number, because the mean of its divisors is an integer number (1710010831279).

Almost surely, 2^{3420021662557} is an apocalyptic number.

It is an amenable number.

3420021662557 is a deficient number, since it is larger than the sum of its proper divisors (1).

3420021662557 is an equidigital number, since it uses as much as digits as its factorization.

3420021662557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 604800, while the sum is 43.

The spelling of 3420021662557 in words is "three trillion, four hundred twenty billion, twenty-one million, six hundred sixty-two thousand, five hundred fifty-seven".