61566377 has 8 divisors (see below), whose sum is σ = 64433664. Its totient is φ = 58715008.

The previous prime is 61566347. The next prime is 61566383. The reversal of 61566377 is 77366516.

61566377 = 229² + 230² + ... + 581².

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61566377 is a prime.

It is a super-2 number, since 2×61566377² = 7580837553812258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61566347) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4328 + ... + 11910.

It is an arithmetic number, because the mean of its divisors is an integer number (8054208).

Almost surely, 2^61566377 is an apocalyptic number.

It is an amenable number.

61566377 is a deficient number, since it is larger than the sum of its proper divisors (2867287).

61566377 is a wasteful number, since it uses less digits than its factorization.

61566377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7959.

The product of its digits is 158760, while the sum is 41.

The square root of 61566377 is about 7846.4244723313. The cubic root of 61566377 is about 394.8642956362.

The spelling of 61566377 in words is "sixty-one million, five hundred sixty-six thousand, three hundred seventy-seven".