61402420415 has 16 divisors (see below), whose sum is σ = 84270431808. Its totient is φ = 42073817856.

The previous prime is 61402420399. The next prime is 61402420483. The reversal of 61402420415 is 51402420416.

It is not a de Polignac number, because 61402420415 - 2⁴ = 61402420399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 590822 + ... + 686931.

It is an arithmetic number, because the mean of its divisors is an integer number (5266901988).

Almost surely, 2^61402420415 is an apocalyptic number.

61402420415 is a deficient number, since it is larger than the sum of its proper divisors (22868011393).

61402420415 is a wasteful number, since it uses less digits than its factorization.

61402420415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279138.

The product of its (nonzero) digits is 7680, while the sum is 29.

Subtracting from 61402420415 its reverse (51402420416), we obtain a palindrome (9999999999).

The spelling of 61402420415 in words is "sixty-one billion, four hundred two million, four hundred twenty thousand, four hundred fifteen".