61564142351 has 2 divisors, whose sum is σ = 61564142352. Its totient is φ = 61564142350.

The previous prime is 61564142333. The next prime is 61564142357. The reversal of 61564142351 is 15324146516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61564142351 is a prime.

It is a super-4 number, since 4×61564142351⁴ (a number of 44 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61564142357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30782071175 + 30782071176.

It is an arithmetic number, because the mean of its divisors is an integer number (30782071176).

Almost surely, 2^61564142351 is an apocalyptic number.

61564142351 is a deficient number, since it is larger than the sum of its proper divisors (1).

61564142351 is an equidigital number, since it uses as much as digits as its factorization.

61564142351 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 38.

Adding to 61564142351 its reverse (15324146516), we get a palindrome (76888288867).

The spelling of 61564142351 in words is "sixty-one billion, five hundred sixty-four million, one hundred forty-two thousand, three hundred fifty-one".