61511408667 has 12 divisors (see below), whose sum is σ = 92140546680. Its totient is φ = 41007605616.

The previous prime is 61511408627. The next prime is 61511408671. The reversal of 61511408667 is 76680411516.

It is not a de Polignac number, because 61511408667 - 2¹² = 61511404571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61511408617) 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 in 11 ways as a sum of consecutive naturals, for example, 126566442 + ... + 126566927.

It is an arithmetic number, because the mean of its divisors is an integer number (7678378890).

Almost surely, 2^61511408667 is an apocalyptic number.

61511408667 is a deficient number, since it is larger than the sum of its proper divisors (30629138013).

61511408667 is an equidigital number, since it uses as much as digits as its factorization.

61511408667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253133384 (or 253133372 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 61511408667 in words is "sixty-one billion, five hundred eleven million, four hundred eight thousand, six hundred sixty-seven".