7661372643 has 48 divisors (see below), whose sum is σ = 12166592256. Its totient is φ = 4624680960.

The previous prime is 7661372639. The next prime is 7661372659. The reversal of 7661372643 is 3462731667.

7661372643 is a `hidden beast` number, since 7 + 6 + 613 + 7 + 26 + 4 + 3 = 666.

It is not a de Polignac number, because 7661372643 - 2² = 7661372639 is a prime.

It is a super-3 number, since 3×7661372643³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (7661372633) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 815871 + ... + 825207.

It is an arithmetic number, because the mean of its divisors is an integer number (253470672).

Almost surely, 2^7661372643 is an apocalyptic number.

7661372643 is a deficient number, since it is larger than the sum of its proper divisors (4505219613).

7661372643 is a wasteful number, since it uses less digits than its factorization.

7661372643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9564 (or 9561 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 7661372643 is about 87529.2673509838. The cubic root of 7661372643 is about 1971.3732635060.

The spelling of 7661372643 in words is "seven billion, six hundred sixty-one million, three hundred seventy-two thousand, six hundred forty-three".