661206835054 has 4 divisors (see below), whose sum is σ = 991810252584. Its totient is φ = 330603417526.

The previous prime is 661206834991. The next prime is 661206835099. The reversal of 661206835054 is 450538602166.

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

It is a junction number, because it is equal to n+sod(n) for n = 661206834995 and 661206835013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 165301708762 + ... + 165301708765.

It is an arithmetic number, because the mean of its divisors is an integer number (247952563146).

Almost surely, 2^661206835054 is an apocalyptic number.

661206835054 is a deficient number, since it is larger than the sum of its proper divisors (330603417530).

661206835054 is a wasteful number, since it uses less digits than its factorization.

661206835054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330603417529.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 661206835054 in words is "six hundred sixty-one billion, two hundred six million, eight hundred thirty-five thousand, fifty-four".