1264862364921 has 9 divisors (see below), whose sum is σ = 1827028289541. Its totient is φ = 843239327292.

The previous prime is 1264862364911. The next prime is 1264862364929. The reversal of 1264862364921 is 1294632684621.

The square root of 1264862364921 is 1124661.

It is a perfect power (a square), and thus also a powerful number.

1264862364921 is a `hidden beast` number, since 1 + 2 + 6 + 4 + 8 + 623 + 6 + 4 + 9 + 2 + 1 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 1264862364921 - 2⁵ = 1264862364889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1264862364929) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3186540 + ... + 3561426.

Almost surely, 2^{1264862364921} is an apocalyptic number.

1264862364921 is the 1124661-st square number.

1264862364921 is the 562331-st centered octagonal number.

It is an amenable number.

1264862364921 is a deficient number, since it is larger than the sum of its proper divisors (562165924620).

1264862364921 is an frugal number, since it uses more digits than its factorization.

1264862364921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749780 (or 374890 counting only the distinct ones).

The product of its digits is 5971968, while the sum is 54.

The spelling of 1264862364921 in words is "one trillion, two hundred sixty-four billion, eight hundred sixty-two million, three hundred sixty-four thousand, nine hundred twenty-one".