651885040171157 has 8 divisors (see below), whose sum is σ = 702030279999384. Its totient is φ = 601739834162688.

The previous prime is 651885040171129. The next prime is 651885040171231. The reversal of 651885040171157 is 751171040588156.

It can be written as a sum of positive squares in 4 ways, for example, as 76224878030596 + 575660162140561 = 8730686^2 + 23992919^2 .

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

It is not a de Polignac number, because 651885040171157 - 2⁶ = 651885040171093 is a prime.

It is a super-2 number, since 2×651885040171157² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 651885040171096 and 651885040171105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651885040171957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43321793 + ... + 56396345.

It is an arithmetic number, because the mean of its divisors is an integer number (87753784999923).

Almost surely, 2^{651885040171157} is an apocalyptic number.

It is an amenable number.

651885040171157 is a deficient number, since it is larger than the sum of its proper divisors (50145239828227).

651885040171157 is a wasteful number, since it uses less digits than its factorization.

651885040171157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16909879.

The product of its (nonzero) digits is 9408000, while the sum is 59.

The spelling of 651885040171157 in words is "six hundred fifty-one trillion, eight hundred eighty-five billion, forty million, one hundred seventy-one thousand, one hundred fifty-seven".