61511061063545 has 4 divisors (see below), whose sum is σ = 73813273276260. Its totient is φ = 49208848850832.

The previous prime is 61511061063541. The next prime is 61511061063589. The reversal of 61511061063545 is 54536016011516.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19948657497664 + 41562403565881 = 4466392^2 + 6446891^2 .

It is a cyclic number.

It is not a de Polignac number, because 61511061063545 - 2² = 61511061063541 is a prime.

It is a super-2 number, since 2×61511061063545² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 61511061063496 and 61511061063505.

It is not an unprimeable number, because it can be changed into a prime (61511061063541) 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, 6151106106350 + ... + 6151106106359.

It is an arithmetic number, because the mean of its divisors is an integer number (18453318319065).

Almost surely, 2^{61511061063545} is an apocalyptic number.

It is an amenable number.

61511061063545 is a deficient number, since it is larger than the sum of its proper divisors (12302212212715).

61511061063545 is a wasteful number, since it uses less digits than its factorization.

61511061063545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12302212212714.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 61511061063545 in words is "sixty-one trillion, five hundred eleven billion, sixty-one million, sixty-three thousand, five hundred forty-five".