615667601 has 4 divisors (see below), whose sum is σ = 615724032. Its totient is φ = 615611172.

The previous prime is 615667589. The next prime is 615667639. The reversal of 615667601 is 106766516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 615667601 - 2²² = 611473297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615667691) 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, 6041 + ... + 35606.

It is an arithmetic number, because the mean of its divisors is an integer number (153931008).

Almost surely, 2^615667601 is an apocalyptic number.

It is an amenable number.

615667601 is a deficient number, since it is larger than the sum of its proper divisors (56431).

615667601 is a wasteful number, since it uses less digits than its factorization.

615667601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56430.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 615667601 is about 24812.6500196976. The cubic root of 615667601 is about 850.7111008978.

The spelling of 615667601 in words is "six hundred fifteen million, six hundred sixty-seven thousand, six hundred one".