47651665 has 4 divisors (see below), whose sum is σ = 57182004. Its totient is φ = 38121328.

The previous prime is 47651651. The next prime is 47651683. The reversal of 47651665 is 56615674.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56615674 = 2 ⋅28307837.

It can be written as a sum of positive squares in 2 ways, for example, as 17048641 + 30603024 = 4129^2 + 5532^2 .

It is a cyclic number.

It is not a de Polignac number, because 47651665 - 2⁵ = 47651633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4765162 + ... + 4765171.

It is an arithmetic number, because the mean of its divisors is an integer number (14295501).

Almost surely, 2^47651665 is an apocalyptic number.

It is an amenable number.

47651665 is a deficient number, since it is larger than the sum of its proper divisors (9530339).

47651665 is an equidigital number, since it uses as much as digits as its factorization.

47651665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9530338.

The product of its digits is 151200, while the sum is 40.

The square root of 47651665 is about 6903.0185426377. The cubic root of 47651665 is about 362.5428629458.

The spelling of 47651665 in words is "forty-seven million, six hundred fifty-one thousand, six hundred sixty-five".