61966215 has 24 divisors (see below), whose sum is σ = 111388368. Its totient is φ = 33048000.

The previous prime is 61966199. The next prime is 61966217. The reversal of 61966215 is 51266916.

It is not a de Polignac number, because 61966215 - 2⁴ = 61966199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61966215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61966217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24286 + ... + 26715.

It is an arithmetic number, because the mean of its divisors is an integer number (4641182).

Almost surely, 2^61966215 is an apocalyptic number.

61966215 is a deficient number, since it is larger than the sum of its proper divisors (49422153).

61966215 is an equidigital number, since it uses as much as digits as its factorization.

61966215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51021 (or 51009 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 61966215 is about 7871.8622320262. The cubic root of 61966215 is about 395.7172568477.

The spelling of 61966215 in words is "sixty-one million, nine hundred sixty-six thousand, two hundred fifteen".