61520254607 has 4 divisors (see below), whose sum is σ = 70308862416. Its totient is φ = 52731646800.

The previous prime is 61520254591. The next prime is 61520254637. The reversal of 61520254607 is 70645202516.

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

It is not a de Polignac number, because 61520254607 - 2⁴ = 61520254591 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 (61520254637) 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, 4394303894 + ... + 4394303907.

It is an arithmetic number, because the mean of its divisors is an integer number (17577215604).

Almost surely, 2^61520254607 is an apocalyptic number.

61520254607 is a deficient number, since it is larger than the sum of its proper divisors (8788607809).

61520254607 is an equidigital number, since it uses as much as digits as its factorization.

61520254607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8788607808.

The product of its (nonzero) digits is 100800, while the sum is 38.

The spelling of 61520254607 in words is "sixty-one billion, five hundred twenty million, two hundred fifty-four thousand, six hundred seven".