615412261021 has 16 divisors (see below), whose sum is σ = 679762258560. Its totient is φ = 555139126080.

The previous prime is 615412261001. The next prime is 615412261033. The reversal of 615412261021 is 120162214516.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 615412261021 - 2¹⁷ = 615412129949 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 (615412261001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10699890 + ... + 10757251.

It is an arithmetic number, because the mean of its divisors is an integer number (42485141160).

Almost surely, 2^615412261021 is an apocalyptic number.

It is an amenable number.

615412261021 is a deficient number, since it is larger than the sum of its proper divisors (64349997539).

615412261021 is a wasteful number, since it uses less digits than its factorization.

615412261021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21457236.

The product of its (nonzero) digits is 5760, while the sum is 31.

Adding to 615412261021 its reverse (120162214516), we get a palindrome (735574475537).

The spelling of 615412261021 in words is "six hundred fifteen billion, four hundred twelve million, two hundred sixty-one thousand, twenty-one".