61661511150 has 48 divisors (see below), whose sum is σ = 153645368448. Its totient is φ = 16365132000.

The previous prime is 61661511101. The next prime is 61661511157. The reversal of 61661511150 is 5111516616.

It is a super-3 number, since 3×61661511150³ (a number of 33 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61661511157) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 942466 + ... + 1005765.

It is an arithmetic number, because the mean of its divisors is an integer number (3200945176).

Almost surely, 2^61661511150 is an apocalyptic number.

61661511150 is an abundant number, since it is smaller than the sum of its proper divisors (91983857298).

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

61661511150 is a wasteful number, since it uses less digits than its factorization.

61661511150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1948457 (or 1948452 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 33.

The spelling of 61661511150 in words is "sixty-one billion, six hundred sixty-one million, five hundred eleven thousand, one hundred fifty".