615534949697 has 4 divisors (see below), whose sum is σ = 636760292820. Its totient is φ = 594309606576.

The previous prime is 615534949693. The next prime is 615534949699. The reversal of 615534949697 is 796949435516.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176547870976 + 438987078721 = 420176^2 + 662561^2 .

It is a cyclic number.

It is not a de Polignac number, because 615534949697 - 2² = 615534949693 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (615534949693) 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, 10612671518 + ... + 10612671575.

It is an arithmetic number, because the mean of its divisors is an integer number (159190073205).

Almost surely, 2^615534949697 is an apocalyptic number.

It is an amenable number.

615534949697 is a deficient number, since it is larger than the sum of its proper divisors (21225343123).

615534949697 is a wasteful number, since it uses less digits than its factorization.

615534949697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21225343122.

The product of its digits is 220449600, while the sum is 68.

The spelling of 615534949697 in words is "six hundred fifteen billion, five hundred thirty-four million, nine hundred forty-nine thousand, six hundred ninety-seven".