61500006511 has 2 divisors, whose sum is σ = 61500006512. Its totient is φ = 61500006510.

The previous prime is 61500006499. The next prime is 61500006551. The reversal of 61500006511 is 11560000516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61500006511 - 2⁵ = 61500006479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61500006551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750003255 + 30750003256.

It is an arithmetic number, because the mean of its divisors is an integer number (30750003256).

Almost surely, 2^61500006511 is an apocalyptic number.

61500006511 is a deficient number, since it is larger than the sum of its proper divisors (1).

61500006511 is an equidigital number, since it uses as much as digits as its factorization.

61500006511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 25.

The spelling of 61500006511 in words is "sixty-one billion, five hundred million, six thousand, five hundred eleven".