61916378015 has 16 divisors (see below), whose sum is σ = 77013061632. Its totient is φ = 47755624224.

The previous prime is 61916378009. The next prime is 61916378023. The reversal of 61916378015 is 51087361916.

It is a cyclic number.

It is not a de Polignac number, because 61916378015 - 2¹² = 61916373919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1950479 + ... + 1981968.

It is an arithmetic number, because the mean of its divisors is an integer number (4813316352).

Almost surely, 2^61916378015 is an apocalyptic number.

61916378015 is a deficient number, since it is larger than the sum of its proper divisors (15096683617).

61916378015 is a wasteful number, since it uses less digits than its factorization.

61916378015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3932566.

The product of its (nonzero) digits is 272160, while the sum is 47.

The spelling of 61916378015 in words is "sixty-one billion, nine hundred sixteen million, three hundred seventy-eight thousand, fifteen".