61507007213 has 4 divisors (see below), whose sum is σ = 61509842880. Its totient is φ = 61504171548.

The previous prime is 61507007203. The next prime is 61507007227. The reversal of 61507007213 is 31270070516.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61507007213 is a prime.

It is a super-2 number, since 2×61507007213² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 61507007213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61507007203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1385045 + ... + 1428762.

It is an arithmetic number, because the mean of its divisors is an integer number (15377460720).

Almost surely, 2^61507007213 is an apocalyptic number.

It is an amenable number.

61507007213 is a deficient number, since it is larger than the sum of its proper divisors (2835667).

61507007213 is a wasteful number, since it uses less digits than its factorization.

61507007213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2835666.

The product of its (nonzero) digits is 8820, while the sum is 32.

Adding to 61507007213 its reverse (31270070516), we get a palindrome (92777077729).

The spelling of 61507007213 in words is "sixty-one billion, five hundred seven million, seven thousand, two hundred thirteen".