61243215251 has 8 divisors (see below), whose sum is σ = 62560559424. Its totient is φ = 59926466880.

The previous prime is 61243215227. The next prime is 61243215283. The reversal of 61243215251 is 15251234216.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61243215251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61243214251) 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, 62021 + ... + 355433.

It is an arithmetic number, because the mean of its divisors is an integer number (7820069928).

Almost surely, 2^61243215251 is an apocalyptic number.

61243215251 is a deficient number, since it is larger than the sum of its proper divisors (1317344173).

61243215251 is a wasteful number, since it uses less digits than its factorization.

61243215251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297901.

The product of its digits is 14400, while the sum is 32.

Adding to 61243215251 its reverse (15251234216), we get a palindrome (76494449467).

The spelling of 61243215251 in words is "sixty-one billion, two hundred forty-three million, two hundred fifteen thousand, two hundred fifty-one".