7151918857 has 4 divisors (see below), whose sum is σ = 7155843840. Its totient is φ = 7147993876.

The previous prime is 7151918849. The next prime is 7151918863. The reversal of 7151918857 is 7588191517.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7588191517 = 73 ⋅103947829.

It is a cyclic number.

It is not a de Polignac number, because 7151918857 - 2³ = 7151918849 is a prime.

It is a super-2 number, since 2×7151918857² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7151918827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1959757 + ... + 1963402.

It is an arithmetic number, because the mean of its divisors is an integer number (1788960960).

Almost surely, 2^7151918857 is an apocalyptic number.

It is an amenable number.

7151918857 is a deficient number, since it is larger than the sum of its proper divisors (3924983).

7151918857 is a wasteful number, since it uses less digits than its factorization.

7151918857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3924982.

The product of its digits is 705600, while the sum is 52.

The square root of 7151918857 is about 84569.0183045777. The cubic root of 7151918857 is about 1926.6708477052.

The spelling of 7151918857 in words is "seven billion, one hundred fifty-one million, nine hundred eighteen thousand, eight hundred fifty-seven".