61564431511 has 8 divisors (see below), whose sum is σ = 67180207248. Its totient is φ = 55951824000.

The previous prime is 61564431497. The next prime is 61564431529. The reversal of 61564431511 is 11513446516.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61564431511 - 2¹⁵ = 61564398743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61564431311) 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 7 ways as a sum of consecutive naturals, for example, 751330 + ... + 829231.

It is an arithmetic number, because the mean of its divisors is an integer number (8397525906).

Almost surely, 2^61564431511 is an apocalyptic number.

61564431511 is a deficient number, since it is larger than the sum of its proper divisors (5615775737).

61564431511 is a wasteful number, since it uses less digits than its factorization.

61564431511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584113.

The product of its digits is 43200, while the sum is 37.

The spelling of 61564431511 in words is "sixty-one billion, five hundred sixty-four million, four hundred thirty-one thousand, five hundred eleven".