661323426541454 has 8 divisors (see below), whose sum is σ = 1018795548996408. Its totient is φ = 321724910209320.

The previous prime is 661323426541409. The next prime is 661323426541483. The reversal of 661323426541454 is 454145624323166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 661323426541454.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4468401530612 + ... + 4468401530759.

It is an arithmetic number, because the mean of its divisors is an integer number (127349443624551).

Almost surely, 2^{661323426541454} is an apocalyptic number.

661323426541454 is a deficient number, since it is larger than the sum of its proper divisors (357472122454954).

661323426541454 is a wasteful number, since it uses less digits than its factorization.

661323426541454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8936803061410.

The product of its digits is 49766400, while the sum is 56.

The spelling of 661323426541454 in words is "six hundred sixty-one trillion, three hundred twenty-three billion, four hundred twenty-six million, five hundred forty-one thousand, four hundred fifty-four".