661454606454167 has 16 divisors (see below), whose sum is σ = 706181498073600. Its totient is φ = 617743813340160.

The previous prime is 661454606454157. The next prime is 661454606454179. The reversal of 661454606454167 is 761454606454166.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-661454606454167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661454606454127) 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, 342778853 + ... + 344703134.

It is an arithmetic number, because the mean of its divisors is an integer number (44136343629600).

Almost surely, 2^{661454606454167} is an apocalyptic number.

661454606454167 is a deficient number, since it is larger than the sum of its proper divisors (44726891619433).

661454606454167 is a wasteful number, since it uses less digits than its factorization.

661454606454167 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687482726.

The product of its (nonzero) digits is 348364800, while the sum is 65.

Subtracting 661454606454167 from its reverse (761454606454166), we obtain a palindrome (99999999999999).

The spelling of 661454606454167 in words is "six hundred sixty-one trillion, four hundred fifty-four billion, six hundred six million, four hundred fifty-four thousand, one hundred sixty-seven".