61615966 has 8 divisors (see below), whose sum is σ = 94390560. Its totient is φ = 30152448.

The previous prime is 61615951. The next prime is 61615969. The reversal of 61615966 is 66951616.

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

It is a super-2 number, since 2×61615966² = 7593054532226312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61615969) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327651 + ... + 327838.

It is an arithmetic number, because the mean of its divisors is an integer number (11798820).

Almost surely, 2^61615966 is an apocalyptic number.

61615966 is a deficient number, since it is larger than the sum of its proper divisors (32774594).

61615966 is a wasteful number, since it uses less digits than its factorization.

61615966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655538.

The product of its digits is 58320, while the sum is 40.

The square root of 61615966 is about 7849.5838106233. The cubic root of 61615966 is about 394.9702824409.

It can be divided in two parts, 616159 and 66, that added together give a square (616225 = 785²).

The spelling of 61615966 in words is "sixty-one million, six hundred fifteen thousand, nine hundred sixty-six".