61402640320501 has 16 divisors (see below), whose sum is σ = 66773220805296. Its totient is φ = 56227537207296.

The previous prime is 61402640320493. The next prime is 61402640320531. The reversal of 61402640320501 is 10502304620416.

It can be written as a sum of positive squares in 8 ways, for example, as 2555729782225 + 58846910538276 = 1598665^2 + 7671174^2 .

It is a cyclic number.

It is not a de Polignac number, because 61402640320501 - 2³ = 61402640320493 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 (61402640320531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27309805 + ... + 29472541.

It is an arithmetic number, because the mean of its divisors is an integer number (4173326300331).

Almost surely, 2^{61402640320501} is an apocalyptic number.

It is an amenable number.

61402640320501 is a deficient number, since it is larger than the sum of its proper divisors (5370580484795).

61402640320501 is a wasteful number, since it uses less digits than its factorization.

61402640320501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2207928.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 61402640320501 its reverse (10502304620416), we get a palindrome (71904944940917).

The spelling of 61402640320501 in words is "sixty-one trillion, four hundred two billion, six hundred forty million, three hundred twenty thousand, five hundred one".