1225137666 has 32 divisors (see below), whose sum is σ = 2470115520. Its totient is φ = 405082944.

The previous prime is 1225137647. The next prime is 1225137671. The reversal of 1225137666 is 6667315221.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 716020 + ... + 717728.

It is an arithmetic number, because the mean of its divisors is an integer number (77191110).

Almost surely, 2^1225137666 is an apocalyptic number.

1225137666 is an abundant number, since it is smaller than the sum of its proper divisors (1244977854).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1225137666 is a wasteful number, since it uses less digits than its factorization.

1225137666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610.

The product of its digits is 90720, while the sum is 39.

The square root of 1225137666 is about 35001.9666018925. The cubic root of 1225137666 is about 1070.0275609403.

The spelling of 1225137666 in words is "one billion, two hundred twenty-five million, one hundred thirty-seven thousand, six hundred sixty-six".