61616649 has 8 divisors (see below), whose sum is σ = 83502592. Its totient is φ = 40404240.

The previous prime is 61616641. The next prime is 61616651. The reversal of 61616649 is 94661616.

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

It is not a de Polignac number, because 61616649 - 2³ = 61616641 is a prime.

It is a super-2 number, since 2×61616649² = 7593222867978402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61616641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168169 + ... + 168534.

It is an arithmetic number, because the mean of its divisors is an integer number (10437824).

Almost surely, 2^61616649 is an apocalyptic number.

It is an amenable number.

61616649 is a deficient number, since it is larger than the sum of its proper divisors (21885943).

61616649 is a wasteful number, since it uses less digits than its factorization.

61616649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336767.

The product of its digits is 46656, while the sum is 39.

The square root of 61616649 is about 7849.6273159941. The cubic root of 61616649 is about 394.9717418229.

The spelling of 61616649 in words is "sixty-one million, six hundred sixteen thousand, six hundred forty-nine".