1261660623 has 16 divisors (see below), whose sum is σ = 1693440000. Its totient is φ = 835507520.

The previous prime is 1261660583. The next prime is 1261660639. The reversal of 1261660623 is 3260661621.

It is not a de Polignac number, because 1261660623 - 2²⁹ = 724789711 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261660643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 600028 + ... + 602126.

It is an arithmetic number, because the mean of its divisors is an integer number (105840000).

Almost surely, 2^1261660623 is an apocalyptic number.

1261660623 is a deficient number, since it is larger than the sum of its proper divisors (431779377).

1261660623 is a wasteful number, since it uses less digits than its factorization.

1261660623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3342.

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 1261660623 is about 35519.8623730442. The cubic root of 1261660623 is about 1080.5565898207.

The spelling of 1261660623 in words is "one billion, two hundred sixty-one million, six hundred sixty thousand, six hundred twenty-three".