61551516511100 has 216 divisors, whose sum is σ = 172321157719200. Its totient is φ = 18666376819200.

The previous prime is 61551516511097. The next prime is 61551516511103. The reversal of 61551516511100 is 111561515516.

It is an interprime number because it is at equal distance from previous prime (61551516511097) and next prime (61551516511103).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61551516511103) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 6686375 + ... + 12954174.

Almost surely, 2^{61551516511100} is an apocalyptic number.

It is an amenable number.

61551516511100 is an abundant number, since it is smaller than the sum of its proper divisors (110769641208100).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61551516511100 is a wasteful number, since it uses less digits than its factorization.

61551516511100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19640629 (or 19640611 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 38.

The spelling of 61551516511100 in words is "sixty-one trillion, five hundred fifty-one billion, five hundred sixteen million, five hundred eleven thousand, one hundred".