1662251390564 has 6 divisors (see below), whose sum is σ = 2908939933494. Its totient is φ = 831125695280.

The previous prime is 1662251390539. The next prime is 1662251390587. The reversal of 1662251390564 is 4650931522661.

It can be written as a sum of positive squares in only one way, i.e., 1026391872100 + 635859518464 = 1013110^2 + 797408^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207781423817 + ... + 207781423824.

It is an arithmetic number, because the mean of its divisors is an integer number (484823322249).

Almost surely, 2^{1662251390564} is an apocalyptic number.

It is an amenable number.

1662251390564 is a deficient number, since it is larger than the sum of its proper divisors (1246688542930).

1662251390564 is a wasteful number, since it uses less digits than its factorization.

1662251390564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415562847645 (or 415562847643 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 1662251390564 in words is "one trillion, six hundred sixty-two billion, two hundred fifty-one million, three hundred ninety thousand, five hundred sixty-four".