61154961551 has 4 divisors (see below), whose sum is σ = 61444795704. Its totient is φ = 60865127400.

The previous prime is 61154961463. The next prime is 61154961583. The reversal of 61154961551 is 15516945116.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61154961551 - 2²² = 61150767247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61154960551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 144916760 + ... + 144917181.

It is an arithmetic number, because the mean of its divisors is an integer number (15361198926).

Almost surely, 2^61154961551 is an apocalyptic number.

61154961551 is a deficient number, since it is larger than the sum of its proper divisors (289834153).

61154961551 is a wasteful number, since it uses less digits than its factorization.

61154961551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289834152.

The product of its digits is 162000, while the sum is 44.

The spelling of 61154961551 in words is "sixty-one billion, one hundred fifty-four million, nine hundred sixty-one thousand, five hundred fifty-one".