1219997786945 has 16 divisors (see below), whose sum is σ = 1730834300160. Its totient is φ = 807722672064.

The previous prime is 1219997786933. The next prime is 1219997787007. The reversal of 1219997786945 is 5496877999121.

It is not a de Polignac number, because 1219997786945 - 2⁴ = 1219997786929 is a prime.

It is a super-2 number, since 2×1219997786945² (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 15 ways as a sum of consecutive naturals, for example, 600983117 + ... + 600985146.

It is an arithmetic number, because the mean of its divisors is an integer number (108177143760).

Almost surely, 2^{1219997786945} is an apocalyptic number.

It is an amenable number.

1219997786945 is a deficient number, since it is larger than the sum of its proper divisors (510836513215).

1219997786945 is a wasteful number, since it uses less digits than its factorization.

1219997786945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201968304.

The product of its digits is 617258880, while the sum is 77.

The spelling of 1219997786945 in words is "one trillion, two hundred nineteen billion, nine hundred ninety-seven million, seven hundred eighty-six thousand, nine hundred forty-five".