355981683961 has 2 divisors, whose sum is σ = 355981683962. Its totient is φ = 355981683960.

The previous prime is 355981683857. The next prime is 355981683979. The reversal of 355981683961 is 169386189553.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 224125549561 + 131856134400 = 473419^2 + 363120^2 .

It is a cyclic number.

It is not a de Polignac number, because 355981683961 - 2¹³ = 355981675769 is a prime.

It is a super-3 number, since 3×355981683961³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 355981683893 and 355981683902.

It is not a weakly prime, because it can be changed into another prime (355981633961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 177990841980 + 177990841981.

It is an arithmetic number, because the mean of its divisors is an integer number (177990841981).

Almost surely, 2^355981683961 is an apocalyptic number.

It is an amenable number.

355981683961 is a deficient number, since it is larger than the sum of its proper divisors (1).

355981683961 is an equidigital number, since it uses as much as digits as its factorization.

355981683961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 41990400, while the sum is 64.

The spelling of 355981683961 in words is "three hundred fifty-five billion, nine hundred eighty-one million, six hundred eighty-three thousand, nine hundred sixty-one".