61501440001 has 2 divisors, whose sum is σ = 61501440002. Its totient is φ = 61501440000.

The previous prime is 61501439999. The next prime is 61501440029. The reversal of 61501440001 is 10004410516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39680241601 + 21821198400 = 199199^2 + 147720^2 .

It is a cyclic number.

It is not a de Polignac number, because 61501440001 - 2¹ = 61501439999 is a prime.

Together with 61501439999, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61501440031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30750720000 + 30750720001.

It is an arithmetic number, because the mean of its divisors is an integer number (30750720001).

Almost surely, 2^61501440001 is an apocalyptic number.

It is an amenable number.

61501440001 is a deficient number, since it is larger than the sum of its proper divisors (1).

61501440001 is an equidigital number, since it uses as much as digits as its factorization.

61501440001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 22.

Adding to 61501440001 its reverse (10004410516), we get a palindrome (71505850517).

The spelling of 61501440001 in words is "sixty-one billion, five hundred one million, four hundred forty thousand, one".