35400661981 has 4 divisors (see below), whose sum is σ = 35981000764. Its totient is φ = 34820323200.

The previous prime is 35400661973. The next prime is 35400662027. The reversal of 35400661981 is 18916600453.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11730839481 + 23669822500 = 108309^2 + 153850^2 .

It is a cyclic number.

It is not a de Polignac number, because 35400661981 - 2³ = 35400661973 is a prime.

It is a super-2 number, since 2×35400661981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (35400662981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290169300 + ... + 290169421.

It is an arithmetic number, because the mean of its divisors is an integer number (8995250191).

Almost surely, 2^35400661981 is an apocalyptic number.

It is an amenable number.

35400661981 is a deficient number, since it is larger than the sum of its proper divisors (580338783).

35400661981 is an equidigital number, since it uses as much as digits as its factorization.

35400661981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580338782.

The product of its (nonzero) digits is 155520, while the sum is 43.

The spelling of 35400661981 in words is "thirty-five billion, four hundred million, six hundred sixty-one thousand, nine hundred eighty-one".