61266815 has 8 divisors (see below), whose sum is σ = 73569600. Its totient is φ = 48980512.

The previous prime is 61266767. The next prime is 61266847. The reversal of 61266815 is 51866216.

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 61266815 - 2¹⁶ = 61201279 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 6602 + ... + 12888.

It is an arithmetic number, because the mean of its divisors is an integer number (9196200).

Almost surely, 2^61266815 is an apocalyptic number.

61266815 is a deficient number, since it is larger than the sum of its proper divisors (12302785).

61266815 is a wasteful number, since it uses less digits than its factorization.

61266815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8241.

The product of its digits is 17280, while the sum is 35.

The square root of 61266815 is about 7827.3121184734. The cubic root of 61266815 is about 394.2228269655. Note that the first 3 decimals are identical.

The spelling of 61266815 in words is "sixty-one million, two hundred sixty-six thousand, eight hundred fifteen".