61620166567 has 2 divisors, whose sum is σ = 61620166568. Its totient is φ = 61620166566.

The previous prime is 61620166537. The next prime is 61620166627. The reversal of 61620166567 is 76566102616.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61620166567 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61620166507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810083283 + 30810083284.

It is an arithmetic number, because the mean of its divisors is an integer number (30810083284).

Almost surely, 2^61620166567 is an apocalyptic number.

61620166567 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620166567 is an equidigital number, since it uses as much as digits as its factorization.

61620166567 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 61620166567 in words is "sixty-one billion, six hundred twenty million, one hundred sixty-six thousand, five hundred sixty-seven".