1953581354661 has 16 divisors (see below), whose sum is σ = 2665442894400. Its totient is φ = 1272055774080.

The previous prime is 1953581354657. The next prime is 1953581354663. The reversal of 1953581354661 is 1664531853591.

It is a happy number.

It is not a de Polignac number, because 1953581354661 - 2² = 1953581354657 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1953581354663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3746665 + ... + 4236113.

It is an arithmetic number, because the mean of its divisors is an integer number (166590180900).

Almost surely, 2^{1953581354661} is an apocalyptic number.

It is an amenable number.

1953581354661 is a deficient number, since it is larger than the sum of its proper divisors (711861539739).

1953581354661 is a wasteful number, since it uses less digits than its factorization.

1953581354661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 520436.

The product of its digits is 11664000, while the sum is 57.

The spelling of 1953581354661 in words is "one trillion, nine hundred fifty-three billion, five hundred eighty-one million, three hundred fifty-four thousand, six hundred sixty-one".