615464440420 has 12 divisors (see below), whose sum is σ = 1292475324924. Its totient is φ = 246185776160.

The previous prime is 615464440417. The next prime is 615464440439. The reversal of 615464440420 is 24044464516.

It can be written as a sum of positive squares in 2 ways, for example, as 487351987236 + 128112453184 = 698106^2 + 357928^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15386610991 + ... + 15386611030.

It is an arithmetic number, because the mean of its divisors is an integer number (107706277077).

Almost surely, 2^615464440420 is an apocalyptic number.

It is an amenable number.

615464440420 is an abundant number, since it is smaller than the sum of its proper divisors (677010884504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

615464440420 is a wasteful number, since it uses less digits than its factorization.

615464440420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30773222030 (or 30773222028 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 40.

The spelling of 615464440420 in words is "six hundred fifteen billion, four hundred sixty-four million, four hundred forty thousand, four hundred twenty".