2661546623 has 2 divisors, whose sum is σ = 2661546624. Its totient is φ = 2661546622.

The previous prime is 2661546557. The next prime is 2661546697. The reversal of 2661546623 is 3266451662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2661546623 - 2¹⁴ = 2661530239 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2661546523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330773311 + 1330773312.

It is an arithmetic number, because the mean of its divisors is an integer number (1330773312).

Almost surely, 2^2661546623 is an apocalyptic number.

2661546623 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661546623 is an equidigital number, since it uses as much as digits as its factorization.

2661546623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 311040, while the sum is 41.

The square root of 2661546623 is about 51590.1795209127. The cubic root of 2661546623 is about 1385.8344700830.

The spelling of 2661546623 in words is "two billion, six hundred sixty-one million, five hundred forty-six thousand, six hundred twenty-three".