61257228311 has 4 divisors (see below), whose sum is σ = 61863735624. Its totient is φ = 60650721000.

The previous prime is 61257228283. The next prime is 61257228317. The reversal of 61257228311 is 11382275216.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61257228311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61257228317) 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, 303253505 + ... + 303253706.

It is an arithmetic number, because the mean of its divisors is an integer number (15465933906).

Almost surely, 2^61257228311 is an apocalyptic number.

61257228311 is a deficient number, since it is larger than the sum of its proper divisors (606507313).

61257228311 is a wasteful number, since it uses less digits than its factorization.

61257228311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606507312.

The product of its digits is 40320, while the sum is 38.

The spelling of 61257228311 in words is "sixty-one billion, two hundred fifty-seven million, two hundred twenty-eight thousand, three hundred eleven".