61621365671 has 2 divisors, whose sum is σ = 61621365672. Its totient is φ = 61621365670.

The previous prime is 61621365613. The next prime is 61621365683. The reversal of 61621365671 is 17656312616.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61621365671 - 2¹⁴ = 61621349287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61621365601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810682835 + 30810682836.

It is an arithmetic number, because the mean of its divisors is an integer number (30810682836).

Almost surely, 2^61621365671 is an apocalyptic number.

61621365671 is a deficient number, since it is larger than the sum of its proper divisors (1).

61621365671 is an equidigital number, since it uses as much as digits as its factorization.

61621365671 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 44.

The spelling of 61621365671 in words is "sixty-one billion, six hundred twenty-one million, three hundred sixty-five thousand, six hundred seventy-one".