351587775661 has 2 divisors, whose sum is σ = 351587775662. Its totient is φ = 351587775660.

The previous prime is 351587775599. The next prime is 351587775689. The reversal of 351587775661 is 166577785153.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 227821017636 + 123766758025 = 477306^2 + 351805^2 .

It is a cyclic number.

It is not a de Polignac number, because 351587775661 - 2²³ = 351579387053 is a prime.

It is a super-2 number, since 2×351587775661² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 351587775661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (351587775691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 175793887830 + 175793887831.

It is an arithmetic number, because the mean of its divisors is an integer number (175793887831).

Almost surely, 2^351587775661 is an apocalyptic number.

It is an amenable number.

351587775661 is a deficient number, since it is larger than the sum of its proper divisors (1).

351587775661 is an equidigital number, since it uses as much as digits as its factorization.

351587775661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37044000, while the sum is 61.

The spelling of 351587775661 in words is "three hundred fifty-one billion, five hundred eighty-seven million, seven hundred seventy-five thousand, six hundred sixty-one".