5551121661723 has 48 divisors (see below), whose sum is σ = 8781373036800. Its totient is φ = 3351201163200.

The previous prime is 5551121661713. The next prime is 5551121661737. The reversal of 5551121661723 is 3271661211555.

5551121661723 is a `hidden beast` number, since 5 + 5 + 5 + 1 + 1 + 2 + 1 + 6 + 617 + 23 = 666.

It is not a de Polignac number, because 5551121661723 - 2⁴ = 5551121661707 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5551121661713) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 33466290 + ... + 33631752.

It is an arithmetic number, because the mean of its divisors is an integer number (182945271600).

Almost surely, 2^{5551121661723} is an apocalyptic number.

5551121661723 is a deficient number, since it is larger than the sum of its proper divisors (3230251375077).

5551121661723 is a wasteful number, since it uses less digits than its factorization.

5551121661723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166800 (or 166797 counting only the distinct ones).

The product of its digits is 378000, while the sum is 45.

The spelling of 5551121661723 in words is "five trillion, five hundred fifty-one billion, one hundred twenty-one million, six hundred sixty-one thousand, seven hundred twenty-three".