61257824871 has 8 divisors (see below), whose sum is σ = 86481635184. Its totient is φ = 38436282240.

The previous prime is 61257824851. The next prime is 61257824891. The reversal of 61257824871 is 17842875216.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61257824851) and next prime (61257824891).

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

It is not a de Polignac number, because 61257824871 - 2⁷ = 61257824743 is a prime.

It is a super-2 number, since 2×61257824871² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 1201133821 = 61257824871 / (6 + 1 + 2 + 5 + 7 + 8 + 2 + 4 + 8 + 7 + 1).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61257824851) 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, 600566860 + ... + 600566961.

It is an arithmetic number, because the mean of its divisors is an integer number (10810204398).

Almost surely, 2^61257824871 is an apocalyptic number.

61257824871 is a deficient number, since it is larger than the sum of its proper divisors (25223810313).

61257824871 is a wasteful number, since it uses less digits than its factorization.

61257824871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1201133841.

The product of its digits is 1505280, while the sum is 51.

The spelling of 61257824871 in words is "sixty-one billion, two hundred fifty-seven million, eight hundred twenty-four thousand, eight hundred seventy-one".