1221765266602 has 16 divisors (see below), whose sum is σ = 1838935055520. Its totient is φ = 608787976048.

The previous prime is 1221765266587. The next prime is 1221765266651. The reversal of 1221765266602 is 2066625671221.

It is a happy number.

It is a super-2 number, since 2×1221765266602² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2056473 + ... + 2583139.

It is an arithmetic number, because the mean of its divisors is an integer number (114933440970).

Almost surely, 2^{1221765266602} is an apocalyptic number.

1221765266602 is a deficient number, since it is larger than the sum of its proper divisors (617169788918).

1221765266602 is a wasteful number, since it uses less digits than its factorization.

1221765266602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530645.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 1221765266602 in words is "one trillion, two hundred twenty-one billion, seven hundred sixty-five million, two hundred sixty-six thousand, six hundred two".