615206661541 has 4 divisors (see below), whose sum is σ = 617965436032. Its totient is φ = 612447887052.

The previous prime is 615206661523. The next prime is 615206661551. The reversal of 615206661541 is 145166602516.

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.

It is a cyclic number.

It is not a de Polignac number, because 615206661541 - 2¹⁷ = 615206530469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615206661521) 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, 1379386911 + ... + 1379387356.

It is an arithmetic number, because the mean of its divisors is an integer number (154491359008).

Almost surely, 2^615206661541 is an apocalyptic number.

It is an amenable number.

615206661541 is a deficient number, since it is larger than the sum of its proper divisors (2758774491).

615206661541 is a wasteful number, since it uses less digits than its factorization.

615206661541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758774490.

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 615206661541 in words is "six hundred fifteen billion, two hundred six million, six hundred sixty-one thousand, five hundred forty-one".