61528380555 has 16 divisors (see below), whose sum is σ = 101840078880. Its totient is φ = 31683579648.

The previous prime is 61528380533. The next prime is 61528380593. The reversal of 61528380555 is 55508382516.

It is not a de Polignac number, because 61528380555 - 2¹³ = 61528372363 is a prime.

It is a super-2 number, since 2×61528380555² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70721842 + ... + 70722711.

It is an arithmetic number, because the mean of its divisors is an integer number (6365004930).

Almost surely, 2^61528380555 is an apocalyptic number.

61528380555 is a deficient number, since it is larger than the sum of its proper divisors (40311698325).

61528380555 is a wasteful number, since it uses less digits than its factorization.

61528380555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141444590.

The product of its (nonzero) digits is 1440000, while the sum is 48.

The spelling of 61528380555 in words is "sixty-one billion, five hundred twenty-eight million, three hundred eighty thousand, five hundred fifty-five".