7615638615861 has 6 divisors (see below), whose sum is σ = 11000366889590. Its totient is φ = 5077092410568.

The previous prime is 7615638615839. The next prime is 7615638615881. The reversal of 7615638615861 is 1685168365167.

It is a happy number.

7615638615861 is a `hidden beast` number, since 7 + 6 + 1 + 5 + 6 + 3 + 8 + 615 + 8 + 6 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7127666513361 + 487972102500 = 2669769^2 + 698550^2 .

It is not a de Polignac number, because 7615638615861 - 2⁹ = 7615638615349 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 (7615638615811) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 423091034206 + ... + 423091034223.

Almost surely, 2^{7615638615861} is an apocalyptic number.

It is an amenable number.

7615638615861 is a deficient number, since it is larger than the sum of its proper divisors (3384728273729).

7615638615861 is a wasteful number, since it uses less digits than its factorization.

7615638615861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846182068435 (or 846182068432 counting only the distinct ones).

The product of its digits is 43545600, while the sum is 63.

The spelling of 7615638615861 in words is "seven trillion, six hundred fifteen billion, six hundred thirty-eight million, six hundred fifteen thousand, eight hundred sixty-one".