61915663 has 2 divisors, whose sum is σ = 61915664. Its totient is φ = 61915662.

The previous prime is 61915639. The next prime is 61915681. The reversal of 61915663 is 36651916.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61915663 - 2⁹ = 61915151 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61915163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30957831 + 30957832.

It is an arithmetic number, because the mean of its divisors is an integer number (30957832).

Almost surely, 2^61915663 is an apocalyptic number.

61915663 is a deficient number, since it is larger than the sum of its proper divisors (1).

61915663 is an equidigital number, since it uses as much as digits as its factorization.

61915663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29160, while the sum is 37.

The square root of 61915663 is about 7868.6506467119. The cubic root of 61915663 is about 395.6096189407.

The spelling of 61915663 in words is "sixty-one million, nine hundred fifteen thousand, six hundred sixty-three".