1217274661402 has 4 divisors (see below), whose sum is σ = 1825911992106. Its totient is φ = 608637330700.

The previous prime is 1217274661357. The next prime is 1217274661409. The reversal of 1217274661402 is 2041664727121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1102544100441 + 114730560961 = 1050021^2 + 338719^2 .

It is not an unprimeable number, because it can be changed into a prime (1217274661409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 304318665349 + ... + 304318665352.

Almost surely, 2^{1217274661402} is an apocalyptic number.

1217274661402 is a deficient number, since it is larger than the sum of its proper divisors (608637330704).

1217274661402 is an equidigital number, since it uses as much as digits as its factorization.

1217274661402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608637330703.

The product of its (nonzero) digits is 225792, while the sum is 43.

The spelling of 1217274661402 in words is "one trillion, two hundred seventeen billion, two hundred seventy-four million, six hundred sixty-one thousand, four hundred two".