995820121657 has 2 divisors, whose sum is σ = 995820121658. Its totient is φ = 995820121656.

The previous prime is 995820121651. The next prime is 995820121717. The reversal of 995820121657 is 756121028599.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 952896154896 + 42923966761 = 976164^2 + 207181^2 .

It is a cyclic number.

It is not a de Polignac number, because 995820121657 - 2³ = 995820121649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 995820121598 and 995820121607.

It is not a weakly prime, because it can be changed into another prime (995820121651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 497910060828 + 497910060829.

It is an arithmetic number, because the mean of its divisors is an integer number (497910060829).

Almost surely, 2^995820121657 is an apocalyptic number.

It is an amenable number.

995820121657 is a deficient number, since it is larger than the sum of its proper divisors (1).

995820121657 is an equidigital number, since it uses as much as digits as its factorization.

995820121657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2721600, while the sum is 55.

The spelling of 995820121657 in words is "nine hundred ninety-five billion, eight hundred twenty million, one hundred twenty-one thousand, six hundred fifty-seven".