7516661623645 has 8 divisors (see below), whose sum is σ = 9020497151160. Its totient is φ = 6012993830400.

The previous prime is 7516661623633. The next prime is 7516661623657. The reversal of 7516661623645 is 5463261666157.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7516661623633) and next prime (7516661623657).

It can be written as a sum of positive squares in 4 ways, for example, as 819859622521 + 6696802001124 = 905461^2 + 2587818^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7516661623645 - 2²⁷ = 7516527405917 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7516661623645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41834956 + ... + 42014245.

It is an arithmetic number, because the mean of its divisors is an integer number (1127562143895).

Almost surely, 2^{7516661623645} is an apocalyptic number.

It is an amenable number.

7516661623645 is a deficient number, since it is larger than the sum of its proper divisors (1503835527515).

7516661623645 is a wasteful number, since it uses less digits than its factorization.

7516661623645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83867135.

The product of its digits is 32659200, while the sum is 58.

The spelling of 7516661623645 in words is "seven trillion, five hundred sixteen billion, six hundred sixty-one million, six hundred twenty-three thousand, six hundred forty-five".