61640462551 has 2 divisors, whose sum is σ = 61640462552. Its totient is φ = 61640462550.

The previous prime is 61640462491. The next prime is 61640462557. The reversal of 61640462551 is 15526404616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61640462551 - 2²⁹ = 61103591639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61640462557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30820231275 + 30820231276.

It is an arithmetic number, because the mean of its divisors is an integer number (30820231276).

Almost surely, 2^61640462551 is an apocalyptic number.

61640462551 is a deficient number, since it is larger than the sum of its proper divisors (1).

61640462551 is an equidigital number, since it uses as much as digits as its factorization.

61640462551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 40.

The spelling of 61640462551 in words is "sixty-one billion, six hundred forty million, four hundred sixty-two thousand, five hundred fifty-one".