1974655802649 has 64 divisors (see below), whose sum is σ = 2885612994560. Its totient is φ = 1196487754560.

The previous prime is 1974655802621. The next prime is 1974655802659. The reversal of 1974655802649 is 9462085564791.

It is not a de Polignac number, because 1974655802649 - 2⁵ = 1974655802617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1974655802649.

It is not an unprimeable number, because it can be changed into a prime (1974655802659) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 386654154 + ... + 386659260.

It is an arithmetic number, because the mean of its divisors is an integer number (45087703040).

Almost surely, 2^{1974655802649} is an apocalyptic number.

1974655802649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1974655802649 is a deficient number, since it is larger than the sum of its proper divisors (910957191911).

1974655802649 is a wasteful number, since it uses less digits than its factorization.

1974655802649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010.

The product of its (nonzero) digits is 130636800, while the sum is 66.

The spelling of 1974655802649 in words is "one trillion, nine hundred seventy-four billion, six hundred fifty-five million, eight hundred two thousand, six hundred forty-nine".