61137125237 has 4 divisors (see below), whose sum is σ = 61526533836. Its totient is φ = 60747716640.

The previous prime is 61137125233. The next prime is 61137125239. The reversal of 61137125237 is 73252173116.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16865177956 + 44271947281 = 129866^2 + 210409^2 .

It is a cyclic number.

It is not a de Polignac number, because 61137125237 - 2² = 61137125233 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61137125237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61137125233) 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, 194704064 + ... + 194704377.

It is an arithmetic number, because the mean of its divisors is an integer number (15381633459).

Almost surely, 2^61137125237 is an apocalyptic number.

It is an amenable number.

61137125237 is a deficient number, since it is larger than the sum of its proper divisors (389408599).

61137125237 is a wasteful number, since it uses less digits than its factorization.

61137125237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389408598.

The product of its digits is 52920, while the sum is 38.

The spelling of 61137125237 in words is "sixty-one billion, one hundred thirty-seven million, one hundred twenty-five thousand, two hundred thirty-seven".