61515206351 has 2 divisors, whose sum is σ = 61515206352. Its totient is φ = 61515206350.

The previous prime is 61515206329. The next prime is 61515206371. The reversal of 61515206351 is 15360251516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61515206351 is a prime.

It is a super-2 number, since 2×61515206351² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61515206321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30757603175 + 30757603176.

It is an arithmetic number, because the mean of its divisors is an integer number (30757603176).

Almost surely, 2^61515206351 is an apocalyptic number.

61515206351 is a deficient number, since it is larger than the sum of its proper divisors (1).

61515206351 is an equidigital number, since it uses as much as digits as its factorization.

61515206351 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27000, while the sum is 35.

Adding to 61515206351 its reverse (15360251516), we get a palindrome (76875457867).

The spelling of 61515206351 in words is "sixty-one billion, five hundred fifteen million, two hundred six thousand, three hundred fifty-one".