61661511151 has 16 divisors (see below), whose sum is σ = 62498075904. Its totient is φ = 60831584704.

The previous prime is 61661511101. The next prime is 61661511157. The reversal of 61661511151 is 15111516616.

It is a cyclic number.

It is not a de Polignac number, because 61661511151 - 2²³ = 61653122543 is a prime.

It is a super-3 number, since 3×61661511151³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 21239166 + ... + 21242068.

It is an arithmetic number, because the mean of its divisors is an integer number (3906129744).

Almost surely, 2^61661511151 is an apocalyptic number.

61661511151 is a deficient number, since it is larger than the sum of its proper divisors (836564753).

61661511151 is a wasteful number, since it uses less digits than its factorization.

61661511151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950.

The product of its digits is 5400, while the sum is 34.

The spelling of 61661511151 in words is "sixty-one billion, six hundred sixty-one million, five hundred eleven thousand, one hundred fifty-one".