73947065657 has 4 divisors (see below), whose sum is σ = 74988573696. Its totient is φ = 72905557620.

The previous prime is 73947065639. The next prime is 73947065659. The reversal of 73947065657 is 75656074937.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75656074937 = 163 ⋅464147699.

It is a cyclic number.

It is not a de Polignac number, because 73947065657 - 2¹² = 73947061561 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 73947065596 and 73947065605.

It is not an unprimeable number, because it can be changed into a prime (73947065659) 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, 520753913 + ... + 520754054.

It is an arithmetic number, because the mean of its divisors is an integer number (18747143424).

Almost surely, 2^73947065657 is an apocalyptic number.

It is an amenable number.

73947065657 is a deficient number, since it is larger than the sum of its proper divisors (1041508039).

73947065657 is a wasteful number, since it uses less digits than its factorization.

73947065657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041508038.

The product of its (nonzero) digits is 33339600, while the sum is 59.

The spelling of 73947065657 in words is "seventy-three billion, nine hundred forty-seven million, sixty-five thousand, six hundred fifty-seven".