61355620145 has 8 divisors (see below), whose sum is σ = 73635633960. Its totient is φ = 49078569600.

The previous prime is 61355620133. The next prime is 61355620163. The reversal of 61355620145 is 54102655316.

It can be written as a sum of positive squares in 4 ways, for example, as 2201111056 + 59154509089 = 46916^2 + 243217^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61355620145 - 2²⁰ = 61354571569 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 61355620099 and 61355620108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 695006 + ... + 778295.

It is an arithmetic number, because the mean of its divisors is an integer number (9204454245).

Almost surely, 2^61355620145 is an apocalyptic number.

It is an amenable number.

61355620145 is a deficient number, since it is larger than the sum of its proper divisors (12280013815).

61355620145 is a wasteful number, since it uses less digits than its factorization.

61355620145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1481635.

The product of its (nonzero) digits is 108000, while the sum is 38.

The spelling of 61355620145 in words is "sixty-one billion, three hundred fifty-five million, six hundred twenty thousand, one hundred forty-five".